Rays in the universe: Cosmic radiation

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We live in a pool of radioactivity since the world began. An average of 240 particles per m² fall on France every second. This exposure caused by cosmic radiation accounts for 10% of the naturally originating exposure to which we are all subjected.

Fortunately, the Earth has a magnetosphere and an atmosphere. Without these two protective envelopes, radioactivity would be so strong that it would make life impossible...